From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-lf1-x12e.google.com (mail-lf1-x12e.google.com [IPv6:2a00:1450:4864:20::12e]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id 0F9A33B29D for ; Tue, 21 Apr 2020 19:07:38 -0400 (EDT) Received: by mail-lf1-x12e.google.com with SMTP id t11so89155lfe.4 for ; Tue, 21 Apr 2020 16:07:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=JTLic6Z7iWq4poBpObDa5wMjXId6wLrswuIZT8HgZVM=; b=t6VftmkbrDCHw3Wxb9RpxNq0wKwhjsWbzaqsc2NR/QdRD7y2K75yjsb3MDDkyiQmL0 zc7UDrD1mL5yWPyHS4H99XnczowGVso2rktKjZLuhM6IEPNmDycEKtW8eESX38ZGT60q 8acNz3SQgK2044bJflwGLx0oGDc2Tx7rDnHTjEMcfmP/ZrM3Yyqz0eqHVQz3nZMvVxbw Qw0AM6TssPDYzM8DBNLg3D91wUJF7ml4fOHwxq1PESnaklHkWvA4qq39M7CZrCSBdeCF pJnDKiJoF1e2dXw8pLPxoa7U1yvJKyx88igyRfaolJPJIkDaAfb1mRhF1jdzUykBElyF Xk1g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=JTLic6Z7iWq4poBpObDa5wMjXId6wLrswuIZT8HgZVM=; b=aoZkfi5jccIWMCv6KQ7eCEOyCqmM1OJuFo11neF0JeU7pKnxDpS/HuwYwwRDqQ2nL0 oen5lWYoEy/VPAunLt2e5OtQ24dl/41nZFgJBP/TcD/DLutxpPiC1r4Ab2z2toMTH/yS EUbgrvFsGZPDvFQTkbSadSP77SjIyg0+i0e+Kvx5B+HA8gPInIsdYOKayabnfQnqWSCL 4At3vaXlvIV9TCgQ0puq06PJjEi1otKtlrmowcVCAtbUPpgo+TpYca82uTdqFFfrVaPe QovWbTW+5NTn4VW2GLLrDqoBVVxuNmtThDdi+eBODbW4Q0lGnP8hx3oBgOH+bZ+AWFvp Rn4Q== X-Gm-Message-State: AGi0Pub2DCiA8r6OIVFF0qutkqwL0moWMDJq+mJce77SdGVP9LeqLaw0 3eovZ2/GXKetcqXOCzxk6A8= X-Google-Smtp-Source: APiQypJAWA6hKBVx0QzZPePTfpa2hDF/lOLnYC7Qq5nTDfhG6D5xWNVIoDLNQc6ETnJaaWeH2M00Pg== X-Received: by 2002:a19:4b90:: with SMTP id y138mr14794413lfa.39.1587510456997; Tue, 21 Apr 2020 16:07:36 -0700 (PDT) Received: from jonathartonsmbp.lan (83-245-235-192-nat-p.elisa-mobile.fi. [83.245.235.192]) by smtp.gmail.com with ESMTPSA id h14sm3207291lfm.60.2020.04.21.16.07.35 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Tue, 21 Apr 2020 16:07:36 -0700 (PDT) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 11.5 \(3445.9.1\)) From: Jonathan Morton In-Reply-To: Date: Wed, 22 Apr 2020 02:07:35 +0300 Cc: Thibaut , Cake List Content-Transfer-Encoding: quoted-printable Message-Id: <2044323F-4CD0-4A75-91DF-FF2DA3E41B86@gmail.com> References: <75FEC2D9-BFC8-4FA2-A972-D11A823C5528@gmail.com> <603DFF79-D0C0-41BD-A2FB-E40B95A9CBB0@gmail.com> To: Dave Taht X-Mailer: Apple Mail (2.3445.9.1) Subject: Re: [Cake] Advantages to tightly tuning latency X-BeenThere: cake@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: Cake - FQ_codel the next generation List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 21 Apr 2020 23:07:38 -0000 > On 22 Apr, 2020, at 1:50 am, Dave Taht wrote: >=20 > Jon, how's SCE looking? ready for a backport yet? We can't do any sort of wide deployment of SCE until it's been approved = as an Internet experiment by the IETF. Interested individuals can = already compile the SCE-enabled kernel and jump through the hoops to try = things out - carefully. There's a bit of infrastructure code to go with = the new TCP algorithms and qdiscs, so I'm not certain how easy a = backport would be; better to just build the (relatively) current code = for now. IETF TSVWG interim meeting next week (the second of two replacing = planned in-person sessions at Vancouver) will discuss the big ECT(1) = issue, which is hotly disputed between SCE and L4S. The key question is = whether ECT(1) should become a classifier input to the network = (orthogonal to Diffserv but with some of the same basic problems), or an = additional congestion signal output from the network (indicating a = lesser degree of congestion, to which a smaller and more nuanced = response is desired). It's anyone's guess how that will turn out, but = the technical merit is on our side and that really should count for = something. If you're keeping an eye on the TSVWG list, expect a major bombshell to = drop there in the next few days. - Jonathan Morton